Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c73e40557f3138…

MALICIOUS

PDF

75.4 KB Created: 2021-04-07 14:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 86df4d97cbdbc498934efacac35cf33b SHA-1: c25a765950df8070b95711e85086a65c08880553 SHA-256: d9c73e40557f313802c7e82d759c08ebf2db9dbcd1085b106f1e00507596a056
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/strik?utm_term=how+to+hack+a+vending+machine+without+money PDF link annotation
    • https://cdn.sqhk.co/fotutubujuf/dGjiNgg/employee_injury_report_form_template.pdfIn PDF document text
    • https://cdn.sqhk.co/fewibefanid/kPhgsie/13311892318.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/iiMhe8T/whatsapp_gb_sur_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/igihe4v/10638862849.pdfIn PDF document text
    • https://cdn.sqhk.co/vusopukov/jWihoFG/81959674855.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/q3piggh/nielsen_sports_connect_login.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/81acf341-5ec8-409f-b27b-62e079130e04/gumodegolezename.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_905884a6e37348fdb1d3347f9d6b51ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/casio_ga-100cb-1adr_g-shock_erkek_kol_saati.pdfIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_19f5b98474ee49fa9a6e35fa350b1874.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/tebijakug.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_d4ed3132cd514393837e767658a09b9c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lovetijif/feasibility_study_template_example.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/creative_box_packaging_template.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_abe5a071d968497a9b251189ab360b7a.pdf?index=trueIn PDF document text
    • https://6552665f-f3ce-4070-9f47-7b493df4570a.filesusr.com/ugd/3d88c7_ad137c4e31634c01802c21387ed25836.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_402c29ceaa29455d8e45ce7157d95016.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ad71c6-cd41-45d2-b98d-8a68e24e8ed2/bob_evans_turkey_sausage_nutrition_facts.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 5328 bytes
SHA-256: 4b3d02cbf5991c7e8d65287d2a4b0df21bab52fa56d3cfdbe6cf08f0ff79cf1a
font_01_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 9632 bytes
SHA-256: c494ec213d033b776c6a2bc8715ca7d9d9eb664de8725e8272147f4e4af4135d

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